Police in Edinburgh were called to Johnston Terrace at around 1.50pm today (Thursday 30 May) following a report of a disturbance.
Emergency services attended and a man, in his twenties, was pronounced dead by the Scottish Ambulance Service.
A man has been arrested in connection with this incident and officers remain at the scene.
Chief Inspector David Robertson, Area Commander for the City Centre, said: "I would like to reassure local residents and businesses that there is not believed to be any ongoing risk to the public.
"Johnston Terrace and King's Stables Road are currently closed and people are asked to avoid the area, where possible.
"Our enquiries continue and anyone who may have witnessed this, and has not yet spoken to officers, should contact Police Scotland via 101, quoting incident 1876 of 30 May, immediately."